Hurricane recommends 4" on 17x8 and 4" on 17x10 so I think they should work. I was unaware however that there was an FR500 made in 10.5" that had a 4.5 bs. All the 10.5's I have found have been almost 7" bs? I could be wrong though
I don't kow if you are set on those wheels, but I am going with the American racing 427 cobra wheel in 17" on my hurricane. 17x8 up front and 17x11 or 18x10 on the rear. And they offer custom backspace so I can go 4 and 5/4" respectively. Check out the "vintage" wheels at
www.wheelsforless.com. Seriously the best prices I've found and free shipping.